I have been facing this issue since 1 month. that patch scan got failed only on window 7, followed instruction and got changes on win7 . Please refer me tool with I can identify the script error. Because patch scan script got failed at execution time. I have also tried with local administrator account and new admin account. always shown same error.
I have placed new window 7 with fresh installation. it is working on it fine, under same domain, with same credentials and gpo.